$ git clone -n https://src.fedoraproject.org/rpms/Io-language.git /var/lib/mock/f39-build-1534914-36237/root/chroot_tmpdir/scmroot/Io-language
Cloning into '/var/lib/mock/f39-build-1534914-36237/root/chroot_tmpdir/scmroot/Io-language'...
$ git fetch origin 8e10d76e30d2da55ee4836a2f67368a0ed22f0a5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/Io-language
 * [new ref]         8e10d76e30d2da55ee4836a2f67368a0ed22f0a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8e10d76 Explicitly link against libm